Critical Apache ActiveMQ Vulnerability Exposes Systems to Security Header Injection Attacks

Gbhackers •Divya • June 3, 2026

Apache ActiveMQ users are being urged to apply immediate patches following the disclosure of a critical vulnerability, CVE-2026-42253, that enables HTTP response header injection via improperly handled JMS message properties. The flaw affects both Apache ActiveMQ and ActiveMQ Web components. It has been rated with “important” severity by the Apache Software Foundation. CVE-2026-42253: HTTP Response […]

The full story

This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Critical Apache ActiveMQ Vulnerability Enables Security Header Injection Attacks A critical vulnerability in Apache ActiveMQ, tracked as CVE-2026-42253, has been disclosed, allowing attackers to inject malicious HTTP security headers through improperly handled message properties. This flaw affects both Apache ActiveMQ and ActiveMQ Web components, potentially leading to cross-site scripting and response manipulation attacks. The vulnerability was published on June 1, 2026, and has been rated with 'important' severity by the Apache Software Foundation. Users are urged to apply immediate patches to mitigate the risk. Failure to address this vulnerability could expose systems to significant security threats. Current deployments of affected systems are at risk until patched. 2 sources 73

Extracted Entities

Critical Apache ActiveMQ Vulnerability Exposes Systems to Security Header Injection Attacks

The full story

Extracted Entities

Attack Types (1)

CVEs (1)

Platforms (2)